32821040 has 160 divisors (see below), whose sum is σ = 94279680. Its totient is φ = 10386432.

The previous prime is 32821039. The next prime is 32821043. The reversal of 32821040 is 4012823.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32821043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 698297 + ... + 698343.

It is an arithmetic number, because the mean of its divisors is an integer number (589248).

Almost surely, 2^32821040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 32821040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47139840).

32821040 is an abundant number, since it is smaller than the sum of its proper divisors (61458640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

32821040 is a wasteful number, since it uses less digits than its factorization.

32821040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 32821040 is about 5728.9650025114. The cubic root of 32821040 is about 320.1725631769.

Adding to 32821040 its reverse (4012823), we get a palindrome (36833863).

The spelling of 32821040 in words is "thirty-two million, eight hundred twenty-one thousand, forty".